Car-door lock



(Nb Modl.) J BLANK-ART 2 Sheets-Sheet 1.

CAR DOOR LOCK.

Patented Dec. 28, 1897. @9

m'bneases: Inventor.-

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(No Model.)

GAR DOOR LOCK. N0. 596,1O1. Patented Dec. 28, 1897.

11. W-dfinesses: Inventor.-

PATENT muss.

JOHN BLANKART, OF ST. PAUL, MINNESOTA.

CAR-DOOR LOCK.

SPECIFICATION forming part of Letters Patent No. 596,101, dated December 28, 1897.

Application filed April 3 0, 1 8 9 7.

To all whom it may concern.-

Be it known that 1, JOHN BLANKART, of St. Paul, Ramsey county, Minnesota, have invented certain Improvements in Oar-Door Locks, of which the following is a specification.

My invention relates to improvements in looks for freight-car doors, its object being to provide a lock with which it will be absolutely impossible to tamper without detection.

To this end my invention consists in the features of construction and combination hereinafter particularly described and claimed.

In the accompanying drawings, forming part of this specification, Figure 1 shows my improved lock secured in place in the frame of the door. Fig. 2 is a plan view of the lock with the top plate removed. Fig. 3 is a crosssection on line 00 as of Fig. 2. Fig. i is a detail of the plunger, and Fig. 5 is a partial section through the locking mechanism for the plunger.

In the drawings the look A is secured in the door-stop by bolts 2, passing through the front plate 3 of the lock.

B represents the plunger, passing through supports 4 and 5 in the lock-casing and normally held in the position shown in Fig. 2 by the coil-spring 6. The plunger is locked in retracted position by means of the lockingdog 7, mounted'upon the end of the key-shaft 8 and adapted to be turned into the recess 9 in the plunger, as shown. The dog 7 is normally held' from turning by the spring-wire 10. Arranged adjacent the plunger are the toothed disks 11 and 12, mounted upon the post'13. Upon the periphery of the wheels adjacent each tooth is inscribed a numeral.

An opening 14 is formed in the front plate 2, through which the numbers adjacent two of the teeth are presented, as shown in Fig. 1. This opening is normally covered by a hinged plate 15. The disks are each turned a degree corresponding to the length of one tooth by means of the mechanism shown in Fig. 2. This consists of a pair of dogs 16, projecting through openings in the plunger B and pivoted upon the end of the lever 17. This lever is fulcrumed in an opening in the top of the plunger by the pivot 18. The free end of the lever rests upon the pin 19, working in an opening in the plungerandheld in raised po- .tooth than the other wheel.

Serial No, 634,617. (No model.)

sition by means of the coil-spring 20. This spring thus serves, through the intermediate lever, to hold the dogs in looking engagement with the ratchet-teeth.

When the car-door is closed, the hasp 21, secured upon the door, projects through the opening 23 in the plunger of the look, the stop 24 upon the hasp bearing against the end of the plunger. The parts being in the locked position, as shownin Fig. 2, the hasp 21 is held in the opening of the plunger and removal of it prevented.

When it is desired to unlock the door, the dog 7 is turned out of engagement with the plunger by means of a suitable key, and the plunger can then be pulled out of the casing sufficiently to allow the removalof the hasp. As the plunger is moved forward the springs 20 will give. slightly, allowing the dog 16 to slip over the teeth immediately forward. As the plunger is carried back into normal position by its spring 6 the dogs 16 will engage the teeth over which they have just slipped and turn the wheels through a space corresponding with the length of said teeth. This brings a new series of numbers adjacent the opening in the front of the look.

In order to prevent the wheels being turned by the dog 16 when the plunger is carried forward, I provide the dogs 25, working between the supporting-guides 26 and held in contact with the teeth of the wheels by the spring 27. The shape of the dogs, while preventing forward turning of the wheels, will allow them 'to pass in the opposite direction as the plunger is carried to retracted position by its spring 6.

In order to provide for a large number of combinations of numerals, I preferably provide one of the wheels with one more ratchet- This, as will be readily seen, allows a very large number of different combinations of numerals. Thus .each time the plunger B is carried to retracted position by its spring 6 the ratchet-wheels are turned and a new combination of numerals presented at the opening in the front of the lock.

I claim- 1. In a lock for car-doors, the combination with the plunger provided with an opening to receive the hasp of the door, of theratchetwheels arranged within the casing adjacent said plunger and inscribed with designatingmarks, the means for locking the plunger in retracted position, the pivoted lever carried by said plunger, the dogs carried by said 1eiver and adapted to engage said wheels to turn them a predetermined distance in the travel of the plunger, and the spring normally holdin g said dogs in engagement with said Wheels.

2. In a lock for car-d0ors, the combination with the plunger, provided With an opening to receive the hasp of the door, of the ratchetwheels arranged within the casing adjacent said plunger, and inscribed with designatingmarks, the means for locking the plunger in retracted position, the spring-controlled lever I 5 pivoted in said plunger, and the dogs carried by said lever and adapted to engage said Wheels and turn them a predetermined distance in the travel of the plunger.

In testimony whereof I affix my signature 20 in presence of two witnesses.

JOHN BLANKART.

Witnesses:

II. S. JOHNSON, MINNIE L. THAUWALD. 

